Analogy
The cloud is a bit like renting a house rather than owning it. If you rent, then you've got to put up with the landlord wanting to send builders/decorators in to fix guttering, sort out damp patches, etc., whereas if you own the place then you decide whether or not to fix the guttering, and to a timetable that suits you. If you have to move out whilst the work is being carried out, then you want to be able to dictate when that might be.
OTOH if you want the landlord to fix something you've pointed out, many times, how soon does it get fixed? Will withholding your rent expedite repairs or will you be kicked out onto the streets, along with all your possessions?
This is just another of the examples I trot out as to why it is not as advantageous to move to the cloud as would appear from the marketing hype.